<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    var sheshidu = 80;
    var huashidu;
    huashidu =  5/9.0 * (sheshidu-32)
    huashidu = huashidu.toFixed(3);
    console.log("华氏度："+huashidu)
    console.log("摄氏度："+sheshidu)
</script>
</html>